labor!!

36wk pregnant today 
Went in for my weekly exam
3cm dilated
70% effaced 
Contractions are consistent and painful
Stomach is so hard it hurts to touch it 
Was being induced 2/8 ob said I won't make it to the 8th
Anyone have any idea how long until I actually go into labor?!?
This is my 2nd baby but I didn't experience any of this 1st preg I was induced at 37wk
So this is all new to me
TIA